Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / arch / powerpc / kernel / prom.c
1 /*
2  * Procedures for creating, accessing and interpreting the device tree.
3  *
4  * Paul Mackerras       August 1996.
5  * Copyright (C) 1996-2005 Paul Mackerras.
6  * 
7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8  *    {engebret|bergner}@us.ibm.com 
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 #undef DEBUG
17
18 #include <stdarg.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/module.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/lmb.h>
35
36 #include <asm/prom.h>
37 #include <asm/rtas.h>
38 #include <asm/page.h>
39 #include <asm/processor.h>
40 #include <asm/irq.h>
41 #include <asm/io.h>
42 #include <asm/kdump.h>
43 #include <asm/smp.h>
44 #include <asm/system.h>
45 #include <asm/mmu.h>
46 #include <asm/pgtable.h>
47 #include <asm/pci.h>
48 #include <asm/iommu.h>
49 #include <asm/btext.h>
50 #include <asm/sections.h>
51 #include <asm/machdep.h>
52 #include <asm/pSeries_reconfig.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/phyp_dump.h>
55 #include <asm/kexec.h>
56 #include <mm/mmu_decl.h>
57
58 #ifdef DEBUG
59 #define DBG(fmt...) printk(KERN_ERR fmt)
60 #else
61 #define DBG(fmt...)
62 #endif
63
64
65 static int __initdata dt_root_addr_cells;
66 static int __initdata dt_root_size_cells;
67
68 #ifdef CONFIG_PPC64
69 int __initdata iommu_is_off;
70 int __initdata iommu_force_on;
71 unsigned long tce_alloc_start, tce_alloc_end;
72 #endif
73
74 typedef u32 cell_t;
75
76 #if 0
77 static struct boot_param_header *initial_boot_params __initdata;
78 #else
79 struct boot_param_header *initial_boot_params;
80 #endif
81
82 extern struct device_node *allnodes;    /* temporary while merging */
83
84 extern rwlock_t devtree_lock;   /* temporary while merging */
85
86 /* export that to outside world */
87 struct device_node *of_chosen;
88
89 static inline char *find_flat_dt_string(u32 offset)
90 {
91         return ((char *)initial_boot_params) +
92                 initial_boot_params->off_dt_strings + offset;
93 }
94
95 /**
96  * This function is used to scan the flattened device-tree, it is
97  * used to extract the memory informations at boot before we can
98  * unflatten the tree
99  */
100 int __init of_scan_flat_dt(int (*it)(unsigned long node,
101                                      const char *uname, int depth,
102                                      void *data),
103                            void *data)
104 {
105         unsigned long p = ((unsigned long)initial_boot_params) +
106                 initial_boot_params->off_dt_struct;
107         int rc = 0;
108         int depth = -1;
109
110         do {
111                 u32 tag = *((u32 *)p);
112                 char *pathp;
113                 
114                 p += 4;
115                 if (tag == OF_DT_END_NODE) {
116                         depth --;
117                         continue;
118                 }
119                 if (tag == OF_DT_NOP)
120                         continue;
121                 if (tag == OF_DT_END)
122                         break;
123                 if (tag == OF_DT_PROP) {
124                         u32 sz = *((u32 *)p);
125                         p += 8;
126                         if (initial_boot_params->version < 0x10)
127                                 p = _ALIGN(p, sz >= 8 ? 8 : 4);
128                         p += sz;
129                         p = _ALIGN(p, 4);
130                         continue;
131                 }
132                 if (tag != OF_DT_BEGIN_NODE) {
133                         printk(KERN_WARNING "Invalid tag %x scanning flattened"
134                                " device tree !\n", tag);
135                         return -EINVAL;
136                 }
137                 depth++;
138                 pathp = (char *)p;
139                 p = _ALIGN(p + strlen(pathp) + 1, 4);
140                 if ((*pathp) == '/') {
141                         char *lp, *np;
142                         for (lp = NULL, np = pathp; *np; np++)
143                                 if ((*np) == '/')
144                                         lp = np+1;
145                         if (lp != NULL)
146                                 pathp = lp;
147                 }
148                 rc = it(p, pathp, depth, data);
149                 if (rc != 0)
150                         break;          
151         } while(1);
152
153         return rc;
154 }
155
156 unsigned long __init of_get_flat_dt_root(void)
157 {
158         unsigned long p = ((unsigned long)initial_boot_params) +
159                 initial_boot_params->off_dt_struct;
160
161         while(*((u32 *)p) == OF_DT_NOP)
162                 p += 4;
163         BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
164         p += 4;
165         return _ALIGN(p + strlen((char *)p) + 1, 4);
166 }
167
168 /**
169  * This  function can be used within scan_flattened_dt callback to get
170  * access to properties
171  */
172 void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
173                                  unsigned long *size)
174 {
175         unsigned long p = node;
176
177         do {
178                 u32 tag = *((u32 *)p);
179                 u32 sz, noff;
180                 const char *nstr;
181
182                 p += 4;
183                 if (tag == OF_DT_NOP)
184                         continue;
185                 if (tag != OF_DT_PROP)
186                         return NULL;
187
188                 sz = *((u32 *)p);
189                 noff = *((u32 *)(p + 4));
190                 p += 8;
191                 if (initial_boot_params->version < 0x10)
192                         p = _ALIGN(p, sz >= 8 ? 8 : 4);
193
194                 nstr = find_flat_dt_string(noff);
195                 if (nstr == NULL) {
196                         printk(KERN_WARNING "Can't find property index"
197                                " name !\n");
198                         return NULL;
199                 }
200                 if (strcmp(name, nstr) == 0) {
201                         if (size)
202                                 *size = sz;
203                         return (void *)p;
204                 }
205                 p += sz;
206                 p = _ALIGN(p, 4);
207         } while(1);
208 }
209
210 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
211 {
212         const char* cp;
213         unsigned long cplen, l;
214
215         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
216         if (cp == NULL)
217                 return 0;
218         while (cplen > 0) {
219                 if (strncasecmp(cp, compat, strlen(compat)) == 0)
220                         return 1;
221                 l = strlen(cp) + 1;
222                 cp += l;
223                 cplen -= l;
224         }
225
226         return 0;
227 }
228
229 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
230                                        unsigned long align)
231 {
232         void *res;
233
234         *mem = _ALIGN(*mem, align);
235         res = (void *)*mem;
236         *mem += size;
237
238         return res;
239 }
240
241 static unsigned long __init unflatten_dt_node(unsigned long mem,
242                                               unsigned long *p,
243                                               struct device_node *dad,
244                                               struct device_node ***allnextpp,
245                                               unsigned long fpsize)
246 {
247         struct device_node *np;
248         struct property *pp, **prev_pp = NULL;
249         char *pathp;
250         u32 tag;
251         unsigned int l, allocl;
252         int has_name = 0;
253         int new_format = 0;
254
255         tag = *((u32 *)(*p));
256         if (tag != OF_DT_BEGIN_NODE) {
257                 printk("Weird tag at start of node: %x\n", tag);
258                 return mem;
259         }
260         *p += 4;
261         pathp = (char *)*p;
262         l = allocl = strlen(pathp) + 1;
263         *p = _ALIGN(*p + l, 4);
264
265         /* version 0x10 has a more compact unit name here instead of the full
266          * path. we accumulate the full path size using "fpsize", we'll rebuild
267          * it later. We detect this because the first character of the name is
268          * not '/'.
269          */
270         if ((*pathp) != '/') {
271                 new_format = 1;
272                 if (fpsize == 0) {
273                         /* root node: special case. fpsize accounts for path
274                          * plus terminating zero. root node only has '/', so
275                          * fpsize should be 2, but we want to avoid the first
276                          * level nodes to have two '/' so we use fpsize 1 here
277                          */
278                         fpsize = 1;
279                         allocl = 2;
280                 } else {
281                         /* account for '/' and path size minus terminal 0
282                          * already in 'l'
283                          */
284                         fpsize += l;
285                         allocl = fpsize;
286                 }
287         }
288
289
290         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
291                                 __alignof__(struct device_node));
292         if (allnextpp) {
293                 memset(np, 0, sizeof(*np));
294                 np->full_name = ((char*)np) + sizeof(struct device_node);
295                 if (new_format) {
296                         char *p = np->full_name;
297                         /* rebuild full path for new format */
298                         if (dad && dad->parent) {
299                                 strcpy(p, dad->full_name);
300 #ifdef DEBUG
301                                 if ((strlen(p) + l + 1) != allocl) {
302                                         DBG("%s: p: %d, l: %d, a: %d\n",
303                                             pathp, (int)strlen(p), l, allocl);
304                                 }
305 #endif
306                                 p += strlen(p);
307                         }
308                         *(p++) = '/';
309                         memcpy(p, pathp, l);
310                 } else
311                         memcpy(np->full_name, pathp, l);
312                 prev_pp = &np->properties;
313                 **allnextpp = np;
314                 *allnextpp = &np->allnext;
315                 if (dad != NULL) {
316                         np->parent = dad;
317                         /* we temporarily use the next field as `last_child'*/
318                         if (dad->next == 0)
319                                 dad->child = np;
320                         else
321                                 dad->next->sibling = np;
322                         dad->next = np;
323                 }
324                 kref_init(&np->kref);
325         }
326         while(1) {
327                 u32 sz, noff;
328                 char *pname;
329
330                 tag = *((u32 *)(*p));
331                 if (tag == OF_DT_NOP) {
332                         *p += 4;
333                         continue;
334                 }
335                 if (tag != OF_DT_PROP)
336                         break;
337                 *p += 4;
338                 sz = *((u32 *)(*p));
339                 noff = *((u32 *)((*p) + 4));
340                 *p += 8;
341                 if (initial_boot_params->version < 0x10)
342                         *p = _ALIGN(*p, sz >= 8 ? 8 : 4);
343
344                 pname = find_flat_dt_string(noff);
345                 if (pname == NULL) {
346                         printk("Can't find property name in list !\n");
347                         break;
348                 }
349                 if (strcmp(pname, "name") == 0)
350                         has_name = 1;
351                 l = strlen(pname) + 1;
352                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
353                                         __alignof__(struct property));
354                 if (allnextpp) {
355                         if (strcmp(pname, "linux,phandle") == 0) {
356                                 np->node = *((u32 *)*p);
357                                 if (np->linux_phandle == 0)
358                                         np->linux_phandle = np->node;
359                         }
360                         if (strcmp(pname, "ibm,phandle") == 0)
361                                 np->linux_phandle = *((u32 *)*p);
362                         pp->name = pname;
363                         pp->length = sz;
364                         pp->value = (void *)*p;
365                         *prev_pp = pp;
366                         prev_pp = &pp->next;
367                 }
368                 *p = _ALIGN((*p) + sz, 4);
369         }
370         /* with version 0x10 we may not have the name property, recreate
371          * it here from the unit name if absent
372          */
373         if (!has_name) {
374                 char *p = pathp, *ps = pathp, *pa = NULL;
375                 int sz;
376
377                 while (*p) {
378                         if ((*p) == '@')
379                                 pa = p;
380                         if ((*p) == '/')
381                                 ps = p + 1;
382                         p++;
383                 }
384                 if (pa < ps)
385                         pa = p;
386                 sz = (pa - ps) + 1;
387                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
388                                         __alignof__(struct property));
389                 if (allnextpp) {
390                         pp->name = "name";
391                         pp->length = sz;
392                         pp->value = pp + 1;
393                         *prev_pp = pp;
394                         prev_pp = &pp->next;
395                         memcpy(pp->value, ps, sz - 1);
396                         ((char *)pp->value)[sz - 1] = 0;
397                         DBG("fixed up name for %s -> %s\n", pathp,
398                                 (char *)pp->value);
399                 }
400         }
401         if (allnextpp) {
402                 *prev_pp = NULL;
403                 np->name = of_get_property(np, "name", NULL);
404                 np->type = of_get_property(np, "device_type", NULL);
405
406                 if (!np->name)
407                         np->name = "<NULL>";
408                 if (!np->type)
409                         np->type = "<NULL>";
410         }
411         while (tag == OF_DT_BEGIN_NODE) {
412                 mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
413                 tag = *((u32 *)(*p));
414         }
415         if (tag != OF_DT_END_NODE) {
416                 printk("Weird tag at end of node: %x\n", tag);
417                 return mem;
418         }
419         *p += 4;
420         return mem;
421 }
422
423 static int __init early_parse_mem(char *p)
424 {
425         if (!p)
426                 return 1;
427
428         memory_limit = PAGE_ALIGN(memparse(p, &p));
429         DBG("memory limit = 0x%lx\n", memory_limit);
430
431         return 0;
432 }
433 early_param("mem", early_parse_mem);
434
435 /**
436  * move_device_tree - move tree to an unused area, if needed.
437  *
438  * The device tree may be allocated beyond our memory limit, or inside the
439  * crash kernel region for kdump. If so, move it out of the way.
440  */
441 static void __init move_device_tree(void)
442 {
443         unsigned long start, size;
444         void *p;
445
446         DBG("-> move_device_tree\n");
447
448         start = __pa(initial_boot_params);
449         size = initial_boot_params->totalsize;
450
451         if ((memory_limit && (start + size) > memory_limit) ||
452                         overlaps_crashkernel(start, size)) {
453                 p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size));
454                 memcpy(p, initial_boot_params, size);
455                 initial_boot_params = (struct boot_param_header *)p;
456                 DBG("Moved device tree to 0x%p\n", p);
457         }
458
459         DBG("<- move_device_tree\n");
460 }
461
462 /**
463  * unflattens the device-tree passed by the firmware, creating the
464  * tree of struct device_node. It also fills the "name" and "type"
465  * pointers of the nodes so the normal device-tree walking functions
466  * can be used (this used to be done by finish_device_tree)
467  */
468 void __init unflatten_device_tree(void)
469 {
470         unsigned long start, mem, size;
471         struct device_node **allnextp = &allnodes;
472
473         DBG(" -> unflatten_device_tree()\n");
474
475         /* First pass, scan for size */
476         start = ((unsigned long)initial_boot_params) +
477                 initial_boot_params->off_dt_struct;
478         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
479         size = (size | 3) + 1;
480
481         DBG("  size is %lx, allocating...\n", size);
482
483         /* Allocate memory for the expanded device tree */
484         mem = lmb_alloc(size + 4, __alignof__(struct device_node));
485         mem = (unsigned long) __va(mem);
486
487         ((u32 *)mem)[size / 4] = 0xdeadbeef;
488
489         DBG("  unflattening %lx...\n", mem);
490
491         /* Second pass, do actual unflattening */
492         start = ((unsigned long)initial_boot_params) +
493                 initial_boot_params->off_dt_struct;
494         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
495         if (*((u32 *)start) != OF_DT_END)
496                 printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
497         if (((u32 *)mem)[size / 4] != 0xdeadbeef)
498                 printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
499                        ((u32 *)mem)[size / 4] );
500         *allnextp = NULL;
501
502         /* Get pointer to OF "/chosen" node for use everywhere */
503         of_chosen = of_find_node_by_path("/chosen");
504         if (of_chosen == NULL)
505                 of_chosen = of_find_node_by_path("/chosen@0");
506
507         DBG(" <- unflatten_device_tree()\n");
508 }
509
510 /*
511  * ibm,pa-features is a per-cpu property that contains a string of
512  * attribute descriptors, each of which has a 2 byte header plus up
513  * to 254 bytes worth of processor attribute bits.  First header
514  * byte specifies the number of bytes following the header.
515  * Second header byte is an "attribute-specifier" type, of which
516  * zero is the only currently-defined value.
517  * Implementation:  Pass in the byte and bit offset for the feature
518  * that we are interested in.  The function will return -1 if the
519  * pa-features property is missing, or a 1/0 to indicate if the feature
520  * is supported/not supported.  Note that the bit numbers are
521  * big-endian to match the definition in PAPR.
522  */
523 static struct ibm_pa_feature {
524         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
525         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
526         unsigned char   pabyte;         /* byte number in ibm,pa-features */
527         unsigned char   pabit;          /* bit number (big-endian) */
528         unsigned char   invert;         /* if 1, pa bit set => clear feature */
529 } ibm_pa_features[] __initdata = {
530         {0, PPC_FEATURE_HAS_MMU,        0, 0, 0},
531         {0, PPC_FEATURE_HAS_FPU,        0, 1, 0},
532         {CPU_FTR_SLB, 0,                0, 2, 0},
533         {CPU_FTR_CTRL, 0,               0, 3, 0},
534         {CPU_FTR_NOEXECUTE, 0,          0, 6, 0},
535         {CPU_FTR_NODSISRALIGN, 0,       1, 1, 1},
536         {CPU_FTR_CI_LARGE_PAGE, 0,      1, 2, 0},
537         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
538 };
539
540 static void __init scan_features(unsigned long node, unsigned char *ftrs,
541                                  unsigned long tablelen,
542                                  struct ibm_pa_feature *fp,
543                                  unsigned long ft_size)
544 {
545         unsigned long i, len, bit;
546
547         /* find descriptor with type == 0 */
548         for (;;) {
549                 if (tablelen < 3)
550                         return;
551                 len = 2 + ftrs[0];
552                 if (tablelen < len)
553                         return;         /* descriptor 0 not found */
554                 if (ftrs[1] == 0)
555                         break;
556                 tablelen -= len;
557                 ftrs += len;
558         }
559
560         /* loop over bits we know about */
561         for (i = 0; i < ft_size; ++i, ++fp) {
562                 if (fp->pabyte >= ftrs[0])
563                         continue;
564                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
565                 if (bit ^ fp->invert) {
566                         cur_cpu_spec->cpu_features |= fp->cpu_features;
567                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
568                 } else {
569                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
570                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
571                 }
572         }
573 }
574
575 static void __init check_cpu_pa_features(unsigned long node)
576 {
577         unsigned char *pa_ftrs;
578         unsigned long tablelen;
579
580         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
581         if (pa_ftrs == NULL)
582                 return;
583
584         scan_features(node, pa_ftrs, tablelen,
585                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
586 }
587
588 #ifdef CONFIG_PPC64
589 static void __init check_cpu_slb_size(unsigned long node)
590 {
591         u32 *slb_size_ptr;
592
593         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
594         if (slb_size_ptr != NULL) {
595                 mmu_slb_size = *slb_size_ptr;
596         }
597 }
598 #else
599 #define check_cpu_slb_size(node) do { } while(0)
600 #endif
601
602 static struct feature_property {
603         const char *name;
604         u32 min_value;
605         unsigned long cpu_feature;
606         unsigned long cpu_user_ftr;
607 } feature_properties[] __initdata = {
608 #ifdef CONFIG_ALTIVEC
609         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
610         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
611 #endif /* CONFIG_ALTIVEC */
612 #ifdef CONFIG_PPC64
613         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
614         {"ibm,purr", 1, CPU_FTR_PURR, 0},
615         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
616 #endif /* CONFIG_PPC64 */
617 };
618
619 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
620 static inline void identical_pvr_fixup(unsigned long node)
621 {
622         unsigned int pvr;
623         char *model = of_get_flat_dt_prop(node, "model", NULL);
624
625         /*
626          * Since 440GR(x)/440EP(x) processors have the same pvr,
627          * we check the node path and set bit 28 in the cur_cpu_spec
628          * pvr for EP(x) processor version. This bit is always 0 in
629          * the "real" pvr. Then we call identify_cpu again with
630          * the new logical pvr to enable FPU support.
631          */
632         if (model && strstr(model, "440EP")) {
633                 pvr = cur_cpu_spec->pvr_value | 0x8;
634                 identify_cpu(0, pvr);
635                 DBG("Using logical pvr %x for %s\n", pvr, model);
636         }
637 }
638 #else
639 #define identical_pvr_fixup(node) do { } while(0)
640 #endif
641
642 static void __init check_cpu_feature_properties(unsigned long node)
643 {
644         unsigned long i;
645         struct feature_property *fp = feature_properties;
646         const u32 *prop;
647
648         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
649                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
650                 if (prop && *prop >= fp->min_value) {
651                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
652                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
653                 }
654         }
655 }
656
657 static int __init early_init_dt_scan_cpus(unsigned long node,
658                                           const char *uname, int depth,
659                                           void *data)
660 {
661         static int logical_cpuid = 0;
662         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
663         const u32 *prop;
664         const u32 *intserv;
665         int i, nthreads;
666         unsigned long len;
667         int found = 0;
668
669         /* We are scanning "cpu" nodes only */
670         if (type == NULL || strcmp(type, "cpu") != 0)
671                 return 0;
672
673         /* Get physical cpuid */
674         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
675         if (intserv) {
676                 nthreads = len / sizeof(int);
677         } else {
678                 intserv = of_get_flat_dt_prop(node, "reg", NULL);
679                 nthreads = 1;
680         }
681
682         /*
683          * Now see if any of these threads match our boot cpu.
684          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
685          */
686         for (i = 0; i < nthreads; i++) {
687                 /*
688                  * version 2 of the kexec param format adds the phys cpuid of
689                  * booted proc.
690                  */
691                 if (initial_boot_params && initial_boot_params->version >= 2) {
692                         if (intserv[i] ==
693                                         initial_boot_params->boot_cpuid_phys) {
694                                 found = 1;
695                                 break;
696                         }
697                 } else {
698                         /*
699                          * Check if it's the boot-cpu, set it's hw index now,
700                          * unfortunately this format did not support booting
701                          * off secondary threads.
702                          */
703                         if (of_get_flat_dt_prop(node,
704                                         "linux,boot-cpu", NULL) != NULL) {
705                                 found = 1;
706                                 break;
707                         }
708                 }
709
710 #ifdef CONFIG_SMP
711                 /* logical cpu id is always 0 on UP kernels */
712                 logical_cpuid++;
713 #endif
714         }
715
716         if (found) {
717                 DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
718                         intserv[i]);
719                 boot_cpuid = logical_cpuid;
720                 set_hard_smp_processor_id(boot_cpuid, intserv[i]);
721
722                 /*
723                  * PAPR defines "logical" PVR values for cpus that
724                  * meet various levels of the architecture:
725                  * 0x0f000001   Architecture version 2.04
726                  * 0x0f000002   Architecture version 2.05
727                  * If the cpu-version property in the cpu node contains
728                  * such a value, we call identify_cpu again with the
729                  * logical PVR value in order to use the cpu feature
730                  * bits appropriate for the architecture level.
731                  *
732                  * A POWER6 partition in "POWER6 architected" mode
733                  * uses the 0x0f000002 PVR value; in POWER5+ mode
734                  * it uses 0x0f000001.
735                  */
736                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
737                 if (prop && (*prop & 0xff000000) == 0x0f000000)
738                         identify_cpu(0, *prop);
739
740                 identical_pvr_fixup(node);
741         }
742
743         check_cpu_feature_properties(node);
744         check_cpu_pa_features(node);
745         check_cpu_slb_size(node);
746
747 #ifdef CONFIG_PPC_PSERIES
748         if (nthreads > 1)
749                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
750         else
751                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
752 #endif
753
754         return 0;
755 }
756
757 #ifdef CONFIG_BLK_DEV_INITRD
758 static void __init early_init_dt_check_for_initrd(unsigned long node)
759 {
760         unsigned long l;
761         u32 *prop;
762
763         DBG("Looking for initrd properties... ");
764
765         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &l);
766         if (prop) {
767                 initrd_start = (unsigned long)__va(of_read_ulong(prop, l/4));
768
769                 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &l);
770                 if (prop) {
771                         initrd_end = (unsigned long)
772                                         __va(of_read_ulong(prop, l/4));
773                         initrd_below_start_ok = 1;
774                 } else {
775                         initrd_start = 0;
776                 }
777         }
778
779         DBG("initrd_start=0x%lx  initrd_end=0x%lx\n", initrd_start, initrd_end);
780 }
781 #else
782 static inline void early_init_dt_check_for_initrd(unsigned long node)
783 {
784 }
785 #endif /* CONFIG_BLK_DEV_INITRD */
786
787 static int __init early_init_dt_scan_chosen(unsigned long node,
788                                             const char *uname, int depth, void *data)
789 {
790         unsigned long *lprop;
791         unsigned long l;
792         char *p;
793
794         DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
795
796         if (depth != 1 ||
797             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
798                 return 0;
799
800 #ifdef CONFIG_PPC64
801         /* check if iommu is forced on or off */
802         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
803                 iommu_is_off = 1;
804         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
805                 iommu_force_on = 1;
806 #endif
807
808         /* mem=x on the command line is the preferred mechanism */
809         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
810         if (lprop)
811                 memory_limit = *lprop;
812
813 #ifdef CONFIG_PPC64
814         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
815         if (lprop)
816                 tce_alloc_start = *lprop;
817         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
818         if (lprop)
819                 tce_alloc_end = *lprop;
820 #endif
821
822 #ifdef CONFIG_KEXEC
823         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
824         if (lprop)
825                 crashk_res.start = *lprop;
826
827         lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
828         if (lprop)
829                 crashk_res.end = crashk_res.start + *lprop - 1;
830 #endif
831
832         early_init_dt_check_for_initrd(node);
833
834         /* Retreive command line */
835         p = of_get_flat_dt_prop(node, "bootargs", &l);
836         if (p != NULL && l > 0)
837                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
838
839 #ifdef CONFIG_CMDLINE
840         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
841                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
842 #endif /* CONFIG_CMDLINE */
843
844         DBG("Command line is: %s\n", cmd_line);
845
846         /* break now */
847         return 1;
848 }
849
850 static int __init early_init_dt_scan_root(unsigned long node,
851                                           const char *uname, int depth, void *data)
852 {
853         u32 *prop;
854
855         if (depth != 0)
856                 return 0;
857
858         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
859         dt_root_size_cells = (prop == NULL) ? 1 : *prop;
860         DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
861
862         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
863         dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
864         DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
865         
866         /* break now */
867         return 1;
868 }
869
870 static u64 __init dt_mem_next_cell(int s, cell_t **cellp)
871 {
872         cell_t *p = *cellp;
873
874         *cellp = p + s;
875         return of_read_number(p, s);
876 }
877
878 #ifdef CONFIG_PPC_PSERIES
879 /*
880  * Interpret the ibm,dynamic-memory property in the
881  * /ibm,dynamic-reconfiguration-memory node.
882  * This contains a list of memory blocks along with NUMA affinity
883  * information.
884  */
885 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
886 {
887         cell_t *dm, *ls;
888         unsigned long l, n, flags;
889         u64 base, size, lmb_size;
890
891         ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
892         if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
893                 return 0;
894         lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
895
896         dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
897         if (dm == NULL || l < sizeof(cell_t))
898                 return 0;
899
900         n = *dm++;      /* number of entries */
901         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
902                 return 0;
903
904         for (; n != 0; --n) {
905                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
906                 flags = dm[3];
907                 /* skip DRC index, pad, assoc. list index, flags */
908                 dm += 4;
909                 /* skip this block if the reserved bit is set in flags (0x80)
910                    or if the block is not assigned to this partition (0x8) */
911                 if ((flags & 0x80) || !(flags & 0x8))
912                         continue;
913                 size = lmb_size;
914                 if (iommu_is_off) {
915                         if (base >= 0x80000000ul)
916                                 continue;
917                         if ((base + size) > 0x80000000ul)
918                                 size = 0x80000000ul - base;
919                 }
920                 lmb_add(base, size);
921         }
922         lmb_dump_all();
923         return 0;
924 }
925 #else
926 #define early_init_dt_scan_drconf_memory(node)  0
927 #endif /* CONFIG_PPC_PSERIES */
928
929 static int __init early_init_dt_scan_memory(unsigned long node,
930                                             const char *uname, int depth, void *data)
931 {
932         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
933         cell_t *reg, *endp;
934         unsigned long l;
935
936         /* Look for the ibm,dynamic-reconfiguration-memory node */
937         if (depth == 1 &&
938             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
939                 return early_init_dt_scan_drconf_memory(node);
940
941         /* We are scanning "memory" nodes only */
942         if (type == NULL) {
943                 /*
944                  * The longtrail doesn't have a device_type on the
945                  * /memory node, so look for the node called /memory@0.
946                  */
947                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
948                         return 0;
949         } else if (strcmp(type, "memory") != 0)
950                 return 0;
951
952         reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
953         if (reg == NULL)
954                 reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
955         if (reg == NULL)
956                 return 0;
957
958         endp = reg + (l / sizeof(cell_t));
959
960         DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
961             uname, l, reg[0], reg[1], reg[2], reg[3]);
962
963         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
964                 u64 base, size;
965
966                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
967                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
968
969                 if (size == 0)
970                         continue;
971                 DBG(" - %llx ,  %llx\n", (unsigned long long)base,
972                     (unsigned long long)size);
973 #ifdef CONFIG_PPC64
974                 if (iommu_is_off) {
975                         if (base >= 0x80000000ul)
976                                 continue;
977                         if ((base + size) > 0x80000000ul)
978                                 size = 0x80000000ul - base;
979                 }
980 #endif
981                 lmb_add(base, size);
982
983                 memstart_addr = min((u64)memstart_addr, base);
984         }
985
986         return 0;
987 }
988
989 static void __init early_reserve_mem(void)
990 {
991         u64 base, size;
992         u64 *reserve_map;
993         unsigned long self_base;
994         unsigned long self_size;
995
996         reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
997                                         initial_boot_params->off_mem_rsvmap);
998
999         /* before we do anything, lets reserve the dt blob */
1000         self_base = __pa((unsigned long)initial_boot_params);
1001         self_size = initial_boot_params->totalsize;
1002         lmb_reserve(self_base, self_size);
1003
1004 #ifdef CONFIG_BLK_DEV_INITRD
1005         /* then reserve the initrd, if any */
1006         if (initrd_start && (initrd_end > initrd_start))
1007                 lmb_reserve(__pa(initrd_start), initrd_end - initrd_start);
1008 #endif /* CONFIG_BLK_DEV_INITRD */
1009
1010 #ifdef CONFIG_PPC32
1011         /* 
1012          * Handle the case where we might be booting from an old kexec
1013          * image that setup the mem_rsvmap as pairs of 32-bit values
1014          */
1015         if (*reserve_map > 0xffffffffull) {
1016                 u32 base_32, size_32;
1017                 u32 *reserve_map_32 = (u32 *)reserve_map;
1018
1019                 while (1) {
1020                         base_32 = *(reserve_map_32++);
1021                         size_32 = *(reserve_map_32++);
1022                         if (size_32 == 0)
1023                                 break;
1024                         /* skip if the reservation is for the blob */
1025                         if (base_32 == self_base && size_32 == self_size)
1026                                 continue;
1027                         DBG("reserving: %x -> %x\n", base_32, size_32);
1028                         lmb_reserve(base_32, size_32);
1029                 }
1030                 return;
1031         }
1032 #endif
1033         while (1) {
1034                 base = *(reserve_map++);
1035                 size = *(reserve_map++);
1036                 if (size == 0)
1037                         break;
1038                 DBG("reserving: %llx -> %llx\n", base, size);
1039                 lmb_reserve(base, size);
1040         }
1041
1042 #if 0
1043         DBG("memory reserved, lmbs :\n");
1044         lmb_dump_all();
1045 #endif
1046 }
1047
1048 #ifdef CONFIG_PHYP_DUMP
1049 /**
1050  * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
1051  *
1052  * Function to find the largest size we need to reserve
1053  * during early boot process.
1054  *
1055  * It either looks for boot param and returns that OR
1056  * returns larger of 256 or 5% rounded down to multiples of 256MB.
1057  *
1058  */
1059 static inline unsigned long phyp_dump_calculate_reserve_size(void)
1060 {
1061         unsigned long tmp;
1062
1063         if (phyp_dump_info->reserve_bootvar)
1064                 return phyp_dump_info->reserve_bootvar;
1065
1066         /* divide by 20 to get 5% of value */
1067         tmp = lmb_end_of_DRAM();
1068         do_div(tmp, 20);
1069
1070         /* round it down in multiples of 256 */
1071         tmp = tmp & ~0x0FFFFFFFUL;
1072
1073         return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
1074 }
1075
1076 /**
1077  * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
1078  *
1079  * This routine may reserve memory regions in the kernel only
1080  * if the system is supported and a dump was taken in last
1081  * boot instance or if the hardware is supported and the
1082  * scratch area needs to be setup. In other instances it returns
1083  * without reserving anything. The memory in case of dump being
1084  * active is freed when the dump is collected (by userland tools).
1085  */
1086 static void __init phyp_dump_reserve_mem(void)
1087 {
1088         unsigned long base, size;
1089         unsigned long variable_reserve_size;
1090
1091         if (!phyp_dump_info->phyp_dump_configured) {
1092                 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
1093                 return;
1094         }
1095
1096         if (!phyp_dump_info->phyp_dump_at_boot) {
1097                 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
1098                 return;
1099         }
1100
1101         variable_reserve_size = phyp_dump_calculate_reserve_size();
1102
1103         if (phyp_dump_info->phyp_dump_is_active) {
1104                 /* Reserve *everything* above RMR.Area freed by userland tools*/
1105                 base = variable_reserve_size;
1106                 size = lmb_end_of_DRAM() - base;
1107
1108                 /* XXX crashed_ram_end is wrong, since it may be beyond
1109                  * the memory_limit, it will need to be adjusted. */
1110                 lmb_reserve(base, size);
1111
1112                 phyp_dump_info->init_reserve_start = base;
1113                 phyp_dump_info->init_reserve_size = size;
1114         } else {
1115                 size = phyp_dump_info->cpu_state_size +
1116                         phyp_dump_info->hpte_region_size +
1117                         variable_reserve_size;
1118                 base = lmb_end_of_DRAM() - size;
1119                 lmb_reserve(base, size);
1120                 phyp_dump_info->init_reserve_start = base;
1121                 phyp_dump_info->init_reserve_size = size;
1122         }
1123 }
1124 #else
1125 static inline void __init phyp_dump_reserve_mem(void) {}
1126 #endif /* CONFIG_PHYP_DUMP  && CONFIG_PPC_RTAS */
1127
1128
1129 void __init early_init_devtree(void *params)
1130 {
1131         DBG(" -> early_init_devtree(%p)\n", params);
1132
1133         /* Setup flat device-tree pointer */
1134         initial_boot_params = params;
1135
1136 #ifdef CONFIG_PPC_RTAS
1137         /* Some machines might need RTAS info for debugging, grab it now. */
1138         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
1139 #endif
1140
1141 #ifdef CONFIG_PHYP_DUMP
1142         /* scan tree to see if dump occured during last boot */
1143         of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
1144 #endif
1145
1146         /* Retrieve various informations from the /chosen node of the
1147          * device-tree, including the platform type, initrd location and
1148          * size, TCE reserve, and more ...
1149          */
1150         of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
1151
1152         /* Scan memory nodes and rebuild LMBs */
1153         lmb_init();
1154         of_scan_flat_dt(early_init_dt_scan_root, NULL);
1155         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
1156
1157         /* Save command line for /proc/cmdline and then parse parameters */
1158         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
1159         parse_early_param();
1160
1161         /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1162         lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
1163         reserve_kdump_trampoline();
1164         reserve_crashkernel();
1165         early_reserve_mem();
1166         phyp_dump_reserve_mem();
1167
1168         lmb_enforce_memory_limit(memory_limit);
1169         lmb_analyze();
1170
1171         DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1172
1173         /* We may need to relocate the flat tree, do it now.
1174          * FIXME .. and the initrd too? */
1175         move_device_tree();
1176
1177         DBG("Scanning CPUs ...\n");
1178
1179         /* Retreive CPU related informations from the flat tree
1180          * (altivec support, boot CPU ID, ...)
1181          */
1182         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
1183
1184         DBG(" <- early_init_devtree()\n");
1185 }
1186
1187
1188 /**
1189  * Indicates whether the root node has a given value in its
1190  * compatible property.
1191  */
1192 int machine_is_compatible(const char *compat)
1193 {
1194         struct device_node *root;
1195         int rc = 0;
1196
1197         root = of_find_node_by_path("/");
1198         if (root) {
1199                 rc = of_device_is_compatible(root, compat);
1200                 of_node_put(root);
1201         }
1202         return rc;
1203 }
1204 EXPORT_SYMBOL(machine_is_compatible);
1205
1206 /*******
1207  *
1208  * New implementation of the OF "find" APIs, return a refcounted
1209  * object, call of_node_put() when done.  The device tree and list
1210  * are protected by a rw_lock.
1211  *
1212  * Note that property management will need some locking as well,
1213  * this isn't dealt with yet.
1214  *
1215  *******/
1216
1217 /**
1218  *      of_find_node_by_phandle - Find a node given a phandle
1219  *      @handle:        phandle of the node to find
1220  *
1221  *      Returns a node pointer with refcount incremented, use
1222  *      of_node_put() on it when done.
1223  */
1224 struct device_node *of_find_node_by_phandle(phandle handle)
1225 {
1226         struct device_node *np;
1227
1228         read_lock(&devtree_lock);
1229         for (np = allnodes; np != 0; np = np->allnext)
1230                 if (np->linux_phandle == handle)
1231                         break;
1232         of_node_get(np);
1233         read_unlock(&devtree_lock);
1234         return np;
1235 }
1236 EXPORT_SYMBOL(of_find_node_by_phandle);
1237
1238 /**
1239  *      of_find_all_nodes - Get next node in global list
1240  *      @prev:  Previous node or NULL to start iteration
1241  *              of_node_put() will be called on it
1242  *
1243  *      Returns a node pointer with refcount incremented, use
1244  *      of_node_put() on it when done.
1245  */
1246 struct device_node *of_find_all_nodes(struct device_node *prev)
1247 {
1248         struct device_node *np;
1249
1250         read_lock(&devtree_lock);
1251         np = prev ? prev->allnext : allnodes;
1252         for (; np != 0; np = np->allnext)
1253                 if (of_node_get(np))
1254                         break;
1255         of_node_put(prev);
1256         read_unlock(&devtree_lock);
1257         return np;
1258 }
1259 EXPORT_SYMBOL(of_find_all_nodes);
1260
1261 /**
1262  *      of_node_get - Increment refcount of a node
1263  *      @node:  Node to inc refcount, NULL is supported to
1264  *              simplify writing of callers
1265  *
1266  *      Returns node.
1267  */
1268 struct device_node *of_node_get(struct device_node *node)
1269 {
1270         if (node)
1271                 kref_get(&node->kref);
1272         return node;
1273 }
1274 EXPORT_SYMBOL(of_node_get);
1275
1276 static inline struct device_node * kref_to_device_node(struct kref *kref)
1277 {
1278         return container_of(kref, struct device_node, kref);
1279 }
1280
1281 /**
1282  *      of_node_release - release a dynamically allocated node
1283  *      @kref:  kref element of the node to be released
1284  *
1285  *      In of_node_put() this function is passed to kref_put()
1286  *      as the destructor.
1287  */
1288 static void of_node_release(struct kref *kref)
1289 {
1290         struct device_node *node = kref_to_device_node(kref);
1291         struct property *prop = node->properties;
1292
1293         /* We should never be releasing nodes that haven't been detached. */
1294         if (!of_node_check_flag(node, OF_DETACHED)) {
1295                 printk("WARNING: Bad of_node_put() on %s\n", node->full_name);
1296                 dump_stack();
1297                 kref_init(&node->kref);
1298                 return;
1299         }
1300
1301         if (!of_node_check_flag(node, OF_DYNAMIC))
1302                 return;
1303
1304         while (prop) {
1305                 struct property *next = prop->next;
1306                 kfree(prop->name);
1307                 kfree(prop->value);
1308                 kfree(prop);
1309                 prop = next;
1310
1311                 if (!prop) {
1312                         prop = node->deadprops;
1313                         node->deadprops = NULL;
1314                 }
1315         }
1316         kfree(node->full_name);
1317         kfree(node->data);
1318         kfree(node);
1319 }
1320
1321 /**
1322  *      of_node_put - Decrement refcount of a node
1323  *      @node:  Node to dec refcount, NULL is supported to
1324  *              simplify writing of callers
1325  *
1326  */
1327 void of_node_put(struct device_node *node)
1328 {
1329         if (node)
1330                 kref_put(&node->kref, of_node_release);
1331 }
1332 EXPORT_SYMBOL(of_node_put);
1333
1334 /*
1335  * Plug a device node into the tree and global list.
1336  */
1337 void of_attach_node(struct device_node *np)
1338 {
1339         unsigned long flags;
1340
1341         write_lock_irqsave(&devtree_lock, flags);
1342         np->sibling = np->parent->child;
1343         np->allnext = allnodes;
1344         np->parent->child = np;
1345         allnodes = np;
1346         write_unlock_irqrestore(&devtree_lock, flags);
1347 }
1348
1349 /*
1350  * "Unplug" a node from the device tree.  The caller must hold
1351  * a reference to the node.  The memory associated with the node
1352  * is not freed until its refcount goes to zero.
1353  */
1354 void of_detach_node(struct device_node *np)
1355 {
1356         struct device_node *parent;
1357         unsigned long flags;
1358
1359         write_lock_irqsave(&devtree_lock, flags);
1360
1361         parent = np->parent;
1362         if (!parent)
1363                 goto out_unlock;
1364
1365         if (allnodes == np)
1366                 allnodes = np->allnext;
1367         else {
1368                 struct device_node *prev;
1369                 for (prev = allnodes;
1370                      prev->allnext != np;
1371                      prev = prev->allnext)
1372                         ;
1373                 prev->allnext = np->allnext;
1374         }
1375
1376         if (parent->child == np)
1377                 parent->child = np->sibling;
1378         else {
1379                 struct device_node *prevsib;
1380                 for (prevsib = np->parent->child;
1381                      prevsib->sibling != np;
1382                      prevsib = prevsib->sibling)
1383                         ;
1384                 prevsib->sibling = np->sibling;
1385         }
1386
1387         of_node_set_flag(np, OF_DETACHED);
1388
1389 out_unlock:
1390         write_unlock_irqrestore(&devtree_lock, flags);
1391 }
1392
1393 #ifdef CONFIG_PPC_PSERIES
1394 /*
1395  * Fix up the uninitialized fields in a new device node:
1396  * name, type and pci-specific fields
1397  */
1398
1399 static int of_finish_dynamic_node(struct device_node *node)
1400 {
1401         struct device_node *parent = of_get_parent(node);
1402         int err = 0;
1403         const phandle *ibm_phandle;
1404
1405         node->name = of_get_property(node, "name", NULL);
1406         node->type = of_get_property(node, "device_type", NULL);
1407
1408         if (!node->name)
1409                 node->name = "<NULL>";
1410         if (!node->type)
1411                 node->type = "<NULL>";
1412
1413         if (!parent) {
1414                 err = -ENODEV;
1415                 goto out;
1416         }
1417
1418         /* We don't support that function on PowerMac, at least
1419          * not yet
1420          */
1421         if (machine_is(powermac))
1422                 return -ENODEV;
1423
1424         /* fix up new node's linux_phandle field */
1425         if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
1426                 node->linux_phandle = *ibm_phandle;
1427
1428 out:
1429         of_node_put(parent);
1430         return err;
1431 }
1432
1433 static int prom_reconfig_notifier(struct notifier_block *nb,
1434                                   unsigned long action, void *node)
1435 {
1436         int err;
1437
1438         switch (action) {
1439         case PSERIES_RECONFIG_ADD:
1440                 err = of_finish_dynamic_node(node);
1441                 if (err < 0) {
1442                         printk(KERN_ERR "finish_node returned %d\n", err);
1443                         err = NOTIFY_BAD;
1444                 }
1445                 break;
1446         default:
1447                 err = NOTIFY_DONE;
1448                 break;
1449         }
1450         return err;
1451 }
1452
1453 static struct notifier_block prom_reconfig_nb = {
1454         .notifier_call = prom_reconfig_notifier,
1455         .priority = 10, /* This one needs to run first */
1456 };
1457
1458 static int __init prom_reconfig_setup(void)
1459 {
1460         return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
1461 }
1462 __initcall(prom_reconfig_setup);
1463 #endif
1464
1465 /*
1466  * Add a property to a node
1467  */
1468 int prom_add_property(struct device_node* np, struct property* prop)
1469 {
1470         struct property **next;
1471         unsigned long flags;
1472
1473         prop->next = NULL;      
1474         write_lock_irqsave(&devtree_lock, flags);
1475         next = &np->properties;
1476         while (*next) {
1477                 if (strcmp(prop->name, (*next)->name) == 0) {
1478                         /* duplicate ! don't insert it */
1479                         write_unlock_irqrestore(&devtree_lock, flags);
1480                         return -1;
1481                 }
1482                 next = &(*next)->next;
1483         }
1484         *next = prop;
1485         write_unlock_irqrestore(&devtree_lock, flags);
1486
1487 #ifdef CONFIG_PROC_DEVICETREE
1488         /* try to add to proc as well if it was initialized */
1489         if (np->pde)
1490                 proc_device_tree_add_prop(np->pde, prop);
1491 #endif /* CONFIG_PROC_DEVICETREE */
1492
1493         return 0;
1494 }
1495
1496 /*
1497  * Remove a property from a node.  Note that we don't actually
1498  * remove it, since we have given out who-knows-how-many pointers
1499  * to the data using get-property.  Instead we just move the property
1500  * to the "dead properties" list, so it won't be found any more.
1501  */
1502 int prom_remove_property(struct device_node *np, struct property *prop)
1503 {
1504         struct property **next;
1505         unsigned long flags;
1506         int found = 0;
1507
1508         write_lock_irqsave(&devtree_lock, flags);
1509         next = &np->properties;
1510         while (*next) {
1511                 if (*next == prop) {
1512                         /* found the node */
1513                         *next = prop->next;
1514                         prop->next = np->deadprops;
1515                         np->deadprops = prop;
1516                         found = 1;
1517                         break;
1518                 }
1519                 next = &(*next)->next;
1520         }
1521         write_unlock_irqrestore(&devtree_lock, flags);
1522
1523         if (!found)
1524                 return -ENODEV;
1525
1526 #ifdef CONFIG_PROC_DEVICETREE
1527         /* try to remove the proc node as well */
1528         if (np->pde)
1529                 proc_device_tree_remove_prop(np->pde, prop);
1530 #endif /* CONFIG_PROC_DEVICETREE */
1531
1532         return 0;
1533 }
1534
1535 /*
1536  * Update a property in a node.  Note that we don't actually
1537  * remove it, since we have given out who-knows-how-many pointers
1538  * to the data using get-property.  Instead we just move the property
1539  * to the "dead properties" list, and add the new property to the
1540  * property list
1541  */
1542 int prom_update_property(struct device_node *np,
1543                          struct property *newprop,
1544                          struct property *oldprop)
1545 {
1546         struct property **next;
1547         unsigned long flags;
1548         int found = 0;
1549
1550         write_lock_irqsave(&devtree_lock, flags);
1551         next = &np->properties;
1552         while (*next) {
1553                 if (*next == oldprop) {
1554                         /* found the node */
1555                         newprop->next = oldprop->next;
1556                         *next = newprop;
1557                         oldprop->next = np->deadprops;
1558                         np->deadprops = oldprop;
1559                         found = 1;
1560                         break;
1561                 }
1562                 next = &(*next)->next;
1563         }
1564         write_unlock_irqrestore(&devtree_lock, flags);
1565
1566         if (!found)
1567                 return -ENODEV;
1568
1569 #ifdef CONFIG_PROC_DEVICETREE
1570         /* try to add to proc as well if it was initialized */
1571         if (np->pde)
1572                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
1573 #endif /* CONFIG_PROC_DEVICETREE */
1574
1575         return 0;
1576 }
1577
1578
1579 /* Find the device node for a given logical cpu number, also returns the cpu
1580  * local thread number (index in ibm,interrupt-server#s) if relevant and
1581  * asked for (non NULL)
1582  */
1583 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
1584 {
1585         int hardid;
1586         struct device_node *np;
1587
1588         hardid = get_hard_smp_processor_id(cpu);
1589
1590         for_each_node_by_type(np, "cpu") {
1591                 const u32 *intserv;
1592                 unsigned int plen, t;
1593
1594                 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1595                  * fallback to "reg" property and assume no threads
1596                  */
1597                 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
1598                                 &plen);
1599                 if (intserv == NULL) {
1600                         const u32 *reg = of_get_property(np, "reg", NULL);
1601                         if (reg == NULL)
1602                                 continue;
1603                         if (*reg == hardid) {
1604                                 if (thread)
1605                                         *thread = 0;
1606                                 return np;
1607                         }
1608                 } else {
1609                         plen /= sizeof(u32);
1610                         for (t = 0; t < plen; t++) {
1611                                 if (hardid == intserv[t]) {
1612                                         if (thread)
1613                                                 *thread = t;
1614                                         return np;
1615                                 }
1616                         }
1617                 }
1618         }
1619         return NULL;
1620 }
1621 EXPORT_SYMBOL(of_get_cpu_node);
1622
1623 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
1624 static struct debugfs_blob_wrapper flat_dt_blob;
1625
1626 static int __init export_flat_device_tree(void)
1627 {
1628         struct dentry *d;
1629
1630         flat_dt_blob.data = initial_boot_params;
1631         flat_dt_blob.size = initial_boot_params->totalsize;
1632
1633         d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
1634                                 powerpc_debugfs_root, &flat_dt_blob);
1635         if (!d)
1636                 return 1;
1637
1638         return 0;
1639 }
1640 __initcall(export_flat_device_tree);
1641 #endif